Avian/ˈeɪviən/ Definition 1 of 3Pro Tip 1/3Zoological Term Primarily used in contexts involving bird life and exhibits. The avian section of the zoo was teeming with colorful parrots. Pro Tip 2/3Disease Connection Sometimes linked to bird-related diseases that can affect humans. Health officials discussed the avian flu's impact on poultry. Pro Tip 3/3Nature Vocabulary Fits well in conversations about wildlife and natural environments. They observed avian nesting behaviors on the nature hike.